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dm writecache: add cond_resched to loop in persistent_memory_claim()
[linux/fpc-iii.git] / drivers / nvme / target / tcp.c
blobf0da04e960f40f2d05a4a5da36db63bd2b1d6dc9
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NVMe over Fabrics TCP target.
4 * Copyright (c) 2018 Lightbits Labs. All rights reserved.
5 */
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/err.h>
11 #include <linux/nvme-tcp.h>
12 #include <net/sock.h>
13 #include <net/tcp.h>
14 #include <linux/inet.h>
15 #include <linux/llist.h>
16 #include <crypto/hash.h>
17
18 #include "nvmet.h"
19
20 #define NVMET_TCP_DEF_INLINE_DATA_SIZE (4 * PAGE_SIZE)
21
22 /* Define the socket priority to use for connections were it is desirable
23 * that the NIC consider performing optimized packet processing or filtering.
24 * A non-zero value being sufficient to indicate general consideration of any
25 * possible optimization. Making it a module param allows for alternative
26 * values that may be unique for some NIC implementations.
27 */
28 static int so_priority;
29 module_param(so_priority, int, 0644);
30 MODULE_PARM_DESC(so_priority, "nvmet tcp socket optimize priority");
31
32 #define NVMET_TCP_RECV_BUDGET 8
33 #define NVMET_TCP_SEND_BUDGET 8
34 #define NVMET_TCP_IO_WORK_BUDGET 64
35
36 enum nvmet_tcp_send_state {
37 NVMET_TCP_SEND_DATA_PDU,
38 NVMET_TCP_SEND_DATA,
39 NVMET_TCP_SEND_R2T,
40 NVMET_TCP_SEND_DDGST,
41 NVMET_TCP_SEND_RESPONSE
42 };
43
44 enum nvmet_tcp_recv_state {
45 NVMET_TCP_RECV_PDU,
46 NVMET_TCP_RECV_DATA,
47 NVMET_TCP_RECV_DDGST,
48 NVMET_TCP_RECV_ERR,
49 };
50
51 enum {
52 NVMET_TCP_F_INIT_FAILED = (1 << 0),
53 };
54
55 struct nvmet_tcp_cmd {
56 struct nvmet_tcp_queue *queue;
57 struct nvmet_req req;
58
59 struct nvme_tcp_cmd_pdu *cmd_pdu;
60 struct nvme_tcp_rsp_pdu *rsp_pdu;
61 struct nvme_tcp_data_pdu *data_pdu;
62 struct nvme_tcp_r2t_pdu *r2t_pdu;
63
64 u32 rbytes_done;
65 u32 wbytes_done;
66
67 u32 pdu_len;
68 u32 pdu_recv;
69 int sg_idx;
70 int nr_mapped;
71 struct msghdr recv_msg;
72 struct kvec *iov;
73 u32 flags;
74
75 struct list_head entry;
76 struct llist_node lentry;
77
78 /* send state */
79 u32 offset;
80 struct scatterlist *cur_sg;
81 enum nvmet_tcp_send_state state;
82
83 __le32 exp_ddgst;
84 __le32 recv_ddgst;
85 };
86
87 enum nvmet_tcp_queue_state {
88 NVMET_TCP_Q_CONNECTING,
89 NVMET_TCP_Q_LIVE,
90 NVMET_TCP_Q_DISCONNECTING,
91 };
92
93 struct nvmet_tcp_queue {
94 struct socket *sock;
95 struct nvmet_tcp_port *port;
96 struct work_struct io_work;
97 int cpu;
98 struct nvmet_cq nvme_cq;
99 struct nvmet_sq nvme_sq;
100
101 /* send state */
102 struct nvmet_tcp_cmd *cmds;
103 unsigned int nr_cmds;
104 struct list_head free_list;
105 struct llist_head resp_list;
106 struct list_head resp_send_list;
107 int send_list_len;
108 struct nvmet_tcp_cmd *snd_cmd;
109
110 /* recv state */
111 int offset;
112 int left;
113 enum nvmet_tcp_recv_state rcv_state;
114 struct nvmet_tcp_cmd *cmd;
115 union nvme_tcp_pdu pdu;
116
117 /* digest state */
118 bool hdr_digest;
119 bool data_digest;
120 struct ahash_request *snd_hash;
121 struct ahash_request *rcv_hash;
122
123 spinlock_t state_lock;
124 enum nvmet_tcp_queue_state state;
125
126 struct sockaddr_storage sockaddr;
127 struct sockaddr_storage sockaddr_peer;
128 struct work_struct release_work;
129
130 int idx;
131 struct list_head queue_list;
132
133 struct nvmet_tcp_cmd connect;
134
135 struct page_frag_cache pf_cache;
136
137 void (*data_ready)(struct sock *);
138 void (*state_change)(struct sock *);
139 void (*write_space)(struct sock *);
140 };
141
142 struct nvmet_tcp_port {
143 struct socket *sock;
144 struct work_struct accept_work;
145 struct nvmet_port *nport;
146 struct sockaddr_storage addr;
147 int last_cpu;
148 void (*data_ready)(struct sock *);
149 };
150
151 static DEFINE_IDA(nvmet_tcp_queue_ida);
152 static LIST_HEAD(nvmet_tcp_queue_list);
153 static DEFINE_MUTEX(nvmet_tcp_queue_mutex);
154
155 static struct workqueue_struct *nvmet_tcp_wq;
156 static struct nvmet_fabrics_ops nvmet_tcp_ops;
157 static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c);
158 static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd);
159
160 static inline u16 nvmet_tcp_cmd_tag(struct nvmet_tcp_queue *queue,
161 struct nvmet_tcp_cmd *cmd)
162 {
163 return cmd - queue->cmds;
164 }
165
166 static inline bool nvmet_tcp_has_data_in(struct nvmet_tcp_cmd *cmd)
167 {
168 return nvme_is_write(cmd->req.cmd) &&
169 cmd->rbytes_done < cmd->req.transfer_len;
170 }
171
172 static inline bool nvmet_tcp_need_data_in(struct nvmet_tcp_cmd *cmd)
173 {
174 return nvmet_tcp_has_data_in(cmd) && !cmd->req.cqe->status;
175 }
176
177 static inline bool nvmet_tcp_need_data_out(struct nvmet_tcp_cmd *cmd)
178 {
179 return !nvme_is_write(cmd->req.cmd) &&
180 cmd->req.transfer_len > 0 &&
181 !cmd->req.cqe->status;
182 }
183
184 static inline bool nvmet_tcp_has_inline_data(struct nvmet_tcp_cmd *cmd)
185 {
186 return nvme_is_write(cmd->req.cmd) && cmd->pdu_len &&
187 !cmd->rbytes_done;
188 }
189
190 static inline struct nvmet_tcp_cmd *
191 nvmet_tcp_get_cmd(struct nvmet_tcp_queue *queue)
192 {
193 struct nvmet_tcp_cmd *cmd;
194
195 cmd = list_first_entry_or_null(&queue->free_list,
196 struct nvmet_tcp_cmd, entry);
197 if (!cmd)
198 return NULL;
199 list_del_init(&cmd->entry);
200
201 cmd->rbytes_done = cmd->wbytes_done = 0;
202 cmd->pdu_len = 0;
203 cmd->pdu_recv = 0;
204 cmd->iov = NULL;
205 cmd->flags = 0;
206 return cmd;
207 }
208
209 static inline void nvmet_tcp_put_cmd(struct nvmet_tcp_cmd *cmd)
210 {
211 if (unlikely(cmd == &cmd->queue->connect))
212 return;
213
214 list_add_tail(&cmd->entry, &cmd->queue->free_list);
215 }
216
217 static inline u8 nvmet_tcp_hdgst_len(struct nvmet_tcp_queue *queue)
218 {
219 return queue->hdr_digest ? NVME_TCP_DIGEST_LENGTH : 0;
220 }
221
222 static inline u8 nvmet_tcp_ddgst_len(struct nvmet_tcp_queue *queue)
223 {
224 return queue->data_digest ? NVME_TCP_DIGEST_LENGTH : 0;
225 }
226
227 static inline void nvmet_tcp_hdgst(struct ahash_request *hash,
228 void *pdu, size_t len)
229 {
230 struct scatterlist sg;
231
232 sg_init_one(&sg, pdu, len);
233 ahash_request_set_crypt(hash, &sg, pdu + len, len);
234 crypto_ahash_digest(hash);
235 }
236
237 static int nvmet_tcp_verify_hdgst(struct nvmet_tcp_queue *queue,
238 void *pdu, size_t len)
239 {
240 struct nvme_tcp_hdr *hdr = pdu;
241 __le32 recv_digest;
242 __le32 exp_digest;
243
244 if (unlikely(!(hdr->flags & NVME_TCP_F_HDGST))) {
245 pr_err("queue %d: header digest enabled but no header digest\n",
246 queue->idx);
247 return -EPROTO;
248 }
249
250 recv_digest = *(__le32 *)(pdu + hdr->hlen);
251 nvmet_tcp_hdgst(queue->rcv_hash, pdu, len);
252 exp_digest = *(__le32 *)(pdu + hdr->hlen);
253 if (recv_digest != exp_digest) {
254 pr_err("queue %d: header digest error: recv %#x expected %#x\n",
255 queue->idx, le32_to_cpu(recv_digest),
256 le32_to_cpu(exp_digest));
257 return -EPROTO;
258 }
259
260 return 0;
261 }
262
263 static int nvmet_tcp_check_ddgst(struct nvmet_tcp_queue *queue, void *pdu)
264 {
265 struct nvme_tcp_hdr *hdr = pdu;
266 u8 digest_len = nvmet_tcp_hdgst_len(queue);
267 u32 len;
268
269 len = le32_to_cpu(hdr->plen) - hdr->hlen -
270 (hdr->flags & NVME_TCP_F_HDGST ? digest_len : 0);
271
272 if (unlikely(len && !(hdr->flags & NVME_TCP_F_DDGST))) {
273 pr_err("queue %d: data digest flag is cleared\n", queue->idx);
274 return -EPROTO;
275 }
276
277 return 0;
278 }
279
280 static void nvmet_tcp_unmap_pdu_iovec(struct nvmet_tcp_cmd *cmd)
281 {
282 struct scatterlist *sg;
283 int i;
284
285 sg = &cmd->req.sg[cmd->sg_idx];
286
287 for (i = 0; i < cmd->nr_mapped; i++)
288 kunmap(sg_page(&sg[i]));
289 }
290
291 static void nvmet_tcp_map_pdu_iovec(struct nvmet_tcp_cmd *cmd)
292 {
293 struct kvec *iov = cmd->iov;
294 struct scatterlist *sg;
295 u32 length, offset, sg_offset;
296
297 length = cmd->pdu_len;
298 cmd->nr_mapped = DIV_ROUND_UP(length, PAGE_SIZE);
299 offset = cmd->rbytes_done;
300 cmd->sg_idx = DIV_ROUND_UP(offset, PAGE_SIZE);
301 sg_offset = offset % PAGE_SIZE;
302 sg = &cmd->req.sg[cmd->sg_idx];
303
304 while (length) {
305 u32 iov_len = min_t(u32, length, sg->length - sg_offset);
306
307 iov->iov_base = kmap(sg_page(sg)) + sg->offset + sg_offset;
308 iov->iov_len = iov_len;
309
310 length -= iov_len;
311 sg = sg_next(sg);
312 iov++;
313 }
314
315 iov_iter_kvec(&cmd->recv_msg.msg_iter, READ, cmd->iov,
316 cmd->nr_mapped, cmd->pdu_len);
317 }
318
319 static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue)
320 {
321 queue->rcv_state = NVMET_TCP_RECV_ERR;
322 if (queue->nvme_sq.ctrl)
323 nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
324 else
325 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
326 }
327
328 static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd)
329 {
330 struct nvme_sgl_desc *sgl = &cmd->req.cmd->common.dptr.sgl;
331 u32 len = le32_to_cpu(sgl->length);
332
333 if (!len)
334 return 0;
335
336 if (sgl->type == ((NVME_SGL_FMT_DATA_DESC << 4) |
337 NVME_SGL_FMT_OFFSET)) {
338 if (!nvme_is_write(cmd->req.cmd))
339 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
340
341 if (len > cmd->req.port->inline_data_size)
342 return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
343 cmd->pdu_len = len;
344 }
345 cmd->req.transfer_len += len;
346
347 cmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt);
348 if (!cmd->req.sg)
349 return NVME_SC_INTERNAL;
350 cmd->cur_sg = cmd->req.sg;
351
352 if (nvmet_tcp_has_data_in(cmd)) {
353 cmd->iov = kmalloc_array(cmd->req.sg_cnt,
354 sizeof(*cmd->iov), GFP_KERNEL);
355 if (!cmd->iov)
356 goto err;
357 }
358
359 return 0;
360 err:
361 sgl_free(cmd->req.sg);
362 return NVME_SC_INTERNAL;
363 }
364
365 static void nvmet_tcp_ddgst(struct ahash_request *hash,
366 struct nvmet_tcp_cmd *cmd)
367 {
368 ahash_request_set_crypt(hash, cmd->req.sg,
369 (void *)&cmd->exp_ddgst, cmd->req.transfer_len);
370 crypto_ahash_digest(hash);
371 }
372
373 static void nvmet_setup_c2h_data_pdu(struct nvmet_tcp_cmd *cmd)
374 {
375 struct nvme_tcp_data_pdu *pdu = cmd->data_pdu;
376 struct nvmet_tcp_queue *queue = cmd->queue;
377 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
378 u8 ddgst = nvmet_tcp_ddgst_len(cmd->queue);
379
380 cmd->offset = 0;
381 cmd->state = NVMET_TCP_SEND_DATA_PDU;
382
383 pdu->hdr.type = nvme_tcp_c2h_data;
384 pdu->hdr.flags = NVME_TCP_F_DATA_LAST | (queue->nvme_sq.sqhd_disabled ?
385 NVME_TCP_F_DATA_SUCCESS : 0);
386 pdu->hdr.hlen = sizeof(*pdu);
387 pdu->hdr.pdo = pdu->hdr.hlen + hdgst;
388 pdu->hdr.plen =
389 cpu_to_le32(pdu->hdr.hlen + hdgst +
390 cmd->req.transfer_len + ddgst);
391 pdu->command_id = cmd->req.cqe->command_id;
392 pdu->data_length = cpu_to_le32(cmd->req.transfer_len);
393 pdu->data_offset = cpu_to_le32(cmd->wbytes_done);
394
395 if (queue->data_digest) {
396 pdu->hdr.flags |= NVME_TCP_F_DDGST;
397 nvmet_tcp_ddgst(queue->snd_hash, cmd);
398 }
399
400 if (cmd->queue->hdr_digest) {
401 pdu->hdr.flags |= NVME_TCP_F_HDGST;
402 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
403 }
404 }
405
406 static void nvmet_setup_r2t_pdu(struct nvmet_tcp_cmd *cmd)
407 {
408 struct nvme_tcp_r2t_pdu *pdu = cmd->r2t_pdu;
409 struct nvmet_tcp_queue *queue = cmd->queue;
410 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
411
412 cmd->offset = 0;
413 cmd->state = NVMET_TCP_SEND_R2T;
414
415 pdu->hdr.type = nvme_tcp_r2t;
416 pdu->hdr.flags = 0;
417 pdu->hdr.hlen = sizeof(*pdu);
418 pdu->hdr.pdo = 0;
419 pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
420
421 pdu->command_id = cmd->req.cmd->common.command_id;
422 pdu->ttag = nvmet_tcp_cmd_tag(cmd->queue, cmd);
423 pdu->r2t_length = cpu_to_le32(cmd->req.transfer_len - cmd->rbytes_done);
424 pdu->r2t_offset = cpu_to_le32(cmd->rbytes_done);
425 if (cmd->queue->hdr_digest) {
426 pdu->hdr.flags |= NVME_TCP_F_HDGST;
427 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
428 }
429 }
430
431 static void nvmet_setup_response_pdu(struct nvmet_tcp_cmd *cmd)
432 {
433 struct nvme_tcp_rsp_pdu *pdu = cmd->rsp_pdu;
434 struct nvmet_tcp_queue *queue = cmd->queue;
435 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
436
437 cmd->offset = 0;
438 cmd->state = NVMET_TCP_SEND_RESPONSE;
439
440 pdu->hdr.type = nvme_tcp_rsp;
441 pdu->hdr.flags = 0;
442 pdu->hdr.hlen = sizeof(*pdu);
443 pdu->hdr.pdo = 0;
444 pdu->hdr.plen = cpu_to_le32(pdu->hdr.hlen + hdgst);
445 if (cmd->queue->hdr_digest) {
446 pdu->hdr.flags |= NVME_TCP_F_HDGST;
447 nvmet_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
448 }
449 }
450
451 static void nvmet_tcp_process_resp_list(struct nvmet_tcp_queue *queue)
452 {
453 struct llist_node *node;
454
455 node = llist_del_all(&queue->resp_list);
456 if (!node)
457 return;
458
459 while (node) {
460 struct nvmet_tcp_cmd *cmd = llist_entry(node,
461 struct nvmet_tcp_cmd, lentry);
462
463 list_add(&cmd->entry, &queue->resp_send_list);
464 node = node->next;
465 queue->send_list_len++;
466 }
467 }
468
469 static struct nvmet_tcp_cmd *nvmet_tcp_fetch_cmd(struct nvmet_tcp_queue *queue)
470 {
471 queue->snd_cmd = list_first_entry_or_null(&queue->resp_send_list,
472 struct nvmet_tcp_cmd, entry);
473 if (!queue->snd_cmd) {
474 nvmet_tcp_process_resp_list(queue);
475 queue->snd_cmd =
476 list_first_entry_or_null(&queue->resp_send_list,
477 struct nvmet_tcp_cmd, entry);
478 if (unlikely(!queue->snd_cmd))
479 return NULL;
480 }
481
482 list_del_init(&queue->snd_cmd->entry);
483 queue->send_list_len--;
484
485 if (nvmet_tcp_need_data_out(queue->snd_cmd))
486 nvmet_setup_c2h_data_pdu(queue->snd_cmd);
487 else if (nvmet_tcp_need_data_in(queue->snd_cmd))
488 nvmet_setup_r2t_pdu(queue->snd_cmd);
489 else
490 nvmet_setup_response_pdu(queue->snd_cmd);
491
492 return queue->snd_cmd;
493 }
494
495 static void nvmet_tcp_queue_response(struct nvmet_req *req)
496 {
497 struct nvmet_tcp_cmd *cmd =
498 container_of(req, struct nvmet_tcp_cmd, req);
499 struct nvmet_tcp_queue *queue = cmd->queue;
500
501 llist_add(&cmd->lentry, &queue->resp_list);
502 queue_work_on(cmd->queue->cpu, nvmet_tcp_wq, &cmd->queue->io_work);
503 }
504
505 static int nvmet_try_send_data_pdu(struct nvmet_tcp_cmd *cmd)
506 {
507 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
508 int left = sizeof(*cmd->data_pdu) - cmd->offset + hdgst;
509 int ret;
510
511 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->data_pdu),
512 offset_in_page(cmd->data_pdu) + cmd->offset,
513 left, MSG_DONTWAIT | MSG_MORE);
514 if (ret <= 0)
515 return ret;
516
517 cmd->offset += ret;
518 left -= ret;
519
520 if (left)
521 return -EAGAIN;
522
523 cmd->state = NVMET_TCP_SEND_DATA;
524 cmd->offset = 0;
525 return 1;
526 }
527
528 static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
529 {
530 struct nvmet_tcp_queue *queue = cmd->queue;
531 int ret;
532
533 while (cmd->cur_sg) {
534 struct page *page = sg_page(cmd->cur_sg);
535 u32 left = cmd->cur_sg->length - cmd->offset;
536 int flags = MSG_DONTWAIT;
537
538 if ((!last_in_batch && cmd->queue->send_list_len) ||
539 cmd->wbytes_done + left < cmd->req.transfer_len ||
540 queue->data_digest || !queue->nvme_sq.sqhd_disabled)
541 flags |= MSG_MORE;
542
543 ret = kernel_sendpage(cmd->queue->sock, page, cmd->offset,
544 left, flags);
545 if (ret <= 0)
546 return ret;
547
548 cmd->offset += ret;
549 cmd->wbytes_done += ret;
550
551 /* Done with sg?*/
552 if (cmd->offset == cmd->cur_sg->length) {
553 cmd->cur_sg = sg_next(cmd->cur_sg);
554 cmd->offset = 0;
555 }
556 }
557
558 if (queue->data_digest) {
559 cmd->state = NVMET_TCP_SEND_DDGST;
560 cmd->offset = 0;
561 } else {
562 if (queue->nvme_sq.sqhd_disabled) {
563 cmd->queue->snd_cmd = NULL;
564 nvmet_tcp_put_cmd(cmd);
565 } else {
566 nvmet_setup_response_pdu(cmd);
567 }
568 }
569
570 if (queue->nvme_sq.sqhd_disabled) {
571 kfree(cmd->iov);
572 sgl_free(cmd->req.sg);
573 }
574
575 return 1;
576
577 }
578
579 static int nvmet_try_send_response(struct nvmet_tcp_cmd *cmd,
580 bool last_in_batch)
581 {
582 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
583 int left = sizeof(*cmd->rsp_pdu) - cmd->offset + hdgst;
584 int flags = MSG_DONTWAIT;
585 int ret;
586
587 if (!last_in_batch && cmd->queue->send_list_len)
588 flags |= MSG_MORE;
589 else
590 flags |= MSG_EOR;
591
592 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->rsp_pdu),
593 offset_in_page(cmd->rsp_pdu) + cmd->offset, left, flags);
594 if (ret <= 0)
595 return ret;
596 cmd->offset += ret;
597 left -= ret;
598
599 if (left)
600 return -EAGAIN;
601
602 kfree(cmd->iov);
603 sgl_free(cmd->req.sg);
604 cmd->queue->snd_cmd = NULL;
605 nvmet_tcp_put_cmd(cmd);
606 return 1;
607 }
608
609 static int nvmet_try_send_r2t(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
610 {
611 u8 hdgst = nvmet_tcp_hdgst_len(cmd->queue);
612 int left = sizeof(*cmd->r2t_pdu) - cmd->offset + hdgst;
613 int flags = MSG_DONTWAIT;
614 int ret;
615
616 if (!last_in_batch && cmd->queue->send_list_len)
617 flags |= MSG_MORE;
618 else
619 flags |= MSG_EOR;
620
621 ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->r2t_pdu),
622 offset_in_page(cmd->r2t_pdu) + cmd->offset, left, flags);
623 if (ret <= 0)
624 return ret;
625 cmd->offset += ret;
626 left -= ret;
627
628 if (left)
629 return -EAGAIN;
630
631 cmd->queue->snd_cmd = NULL;
632 return 1;
633 }
634
635 static int nvmet_try_send_ddgst(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
636 {
637 struct nvmet_tcp_queue *queue = cmd->queue;
638 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
639 struct kvec iov = {
640 .iov_base = &cmd->exp_ddgst + cmd->offset,
641 .iov_len = NVME_TCP_DIGEST_LENGTH - cmd->offset
642 };
643 int ret;
644
645 if (!last_in_batch && cmd->queue->send_list_len)
646 msg.msg_flags |= MSG_MORE;
647
648 ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
649 if (unlikely(ret <= 0))
650 return ret;
651
652 cmd->offset += ret;
653
654 if (queue->nvme_sq.sqhd_disabled) {
655 cmd->queue->snd_cmd = NULL;
656 nvmet_tcp_put_cmd(cmd);
657 } else {
658 nvmet_setup_response_pdu(cmd);
659 }
660 return 1;
661 }
662
663 static int nvmet_tcp_try_send_one(struct nvmet_tcp_queue *queue,
664 bool last_in_batch)
665 {
666 struct nvmet_tcp_cmd *cmd = queue->snd_cmd;
667 int ret = 0;
668
669 if (!cmd || queue->state == NVMET_TCP_Q_DISCONNECTING) {
670 cmd = nvmet_tcp_fetch_cmd(queue);
671 if (unlikely(!cmd))
672 return 0;
673 }
674
675 if (cmd->state == NVMET_TCP_SEND_DATA_PDU) {
676 ret = nvmet_try_send_data_pdu(cmd);
677 if (ret <= 0)
678 goto done_send;
679 }
680
681 if (cmd->state == NVMET_TCP_SEND_DATA) {
682 ret = nvmet_try_send_data(cmd, last_in_batch);
683 if (ret <= 0)
684 goto done_send;
685 }
686
687 if (cmd->state == NVMET_TCP_SEND_DDGST) {
688 ret = nvmet_try_send_ddgst(cmd, last_in_batch);
689 if (ret <= 0)
690 goto done_send;
691 }
692
693 if (cmd->state == NVMET_TCP_SEND_R2T) {
694 ret = nvmet_try_send_r2t(cmd, last_in_batch);
695 if (ret <= 0)
696 goto done_send;
697 }
698
699 if (cmd->state == NVMET_TCP_SEND_RESPONSE)
700 ret = nvmet_try_send_response(cmd, last_in_batch);
701
702 done_send:
703 if (ret < 0) {
704 if (ret == -EAGAIN)
705 return 0;
706 return ret;
707 }
708
709 return 1;
710 }
711
712 static int nvmet_tcp_try_send(struct nvmet_tcp_queue *queue,
713 int budget, int *sends)
714 {
715 int i, ret = 0;
716
717 for (i = 0; i < budget; i++) {
718 ret = nvmet_tcp_try_send_one(queue, i == budget - 1);
719 if (ret <= 0)
720 break;
721 (*sends)++;
722 }
723
724 return ret;
725 }
726
727 static void nvmet_prepare_receive_pdu(struct nvmet_tcp_queue *queue)
728 {
729 queue->offset = 0;
730 queue->left = sizeof(struct nvme_tcp_hdr);
731 queue->cmd = NULL;
732 queue->rcv_state = NVMET_TCP_RECV_PDU;
733 }
734
735 static void nvmet_tcp_free_crypto(struct nvmet_tcp_queue *queue)
736 {
737 struct crypto_ahash *tfm = crypto_ahash_reqtfm(queue->rcv_hash);
738
739 ahash_request_free(queue->rcv_hash);
740 ahash_request_free(queue->snd_hash);
741 crypto_free_ahash(tfm);
742 }
743
744 static int nvmet_tcp_alloc_crypto(struct nvmet_tcp_queue *queue)
745 {
746 struct crypto_ahash *tfm;
747
748 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
749 if (IS_ERR(tfm))
750 return PTR_ERR(tfm);
751
752 queue->snd_hash = ahash_request_alloc(tfm, GFP_KERNEL);
753 if (!queue->snd_hash)
754 goto free_tfm;
755 ahash_request_set_callback(queue->snd_hash, 0, NULL, NULL);
756
757 queue->rcv_hash = ahash_request_alloc(tfm, GFP_KERNEL);
758 if (!queue->rcv_hash)
759 goto free_snd_hash;
760 ahash_request_set_callback(queue->rcv_hash, 0, NULL, NULL);
761
762 return 0;
763 free_snd_hash:
764 ahash_request_free(queue->snd_hash);
765 free_tfm:
766 crypto_free_ahash(tfm);
767 return -ENOMEM;
768 }
769
770
771 static int nvmet_tcp_handle_icreq(struct nvmet_tcp_queue *queue)
772 {
773 struct nvme_tcp_icreq_pdu *icreq = &queue->pdu.icreq;
774 struct nvme_tcp_icresp_pdu *icresp = &queue->pdu.icresp;
775 struct msghdr msg = {};
776 struct kvec iov;
777 int ret;
778
779 if (le32_to_cpu(icreq->hdr.plen) != sizeof(struct nvme_tcp_icreq_pdu)) {
780 pr_err("bad nvme-tcp pdu length (%d)\n",
781 le32_to_cpu(icreq->hdr.plen));
782 nvmet_tcp_fatal_error(queue);
783 }
784
785 if (icreq->pfv != NVME_TCP_PFV_1_0) {
786 pr_err("queue %d: bad pfv %d\n", queue->idx, icreq->pfv);
787 return -EPROTO;
788 }
789
790 if (icreq->hpda != 0) {
791 pr_err("queue %d: unsupported hpda %d\n", queue->idx,
792 icreq->hpda);
793 return -EPROTO;
794 }
795
796 queue->hdr_digest = !!(icreq->digest & NVME_TCP_HDR_DIGEST_ENABLE);
797 queue->data_digest = !!(icreq->digest & NVME_TCP_DATA_DIGEST_ENABLE);
798 if (queue->hdr_digest || queue->data_digest) {
799 ret = nvmet_tcp_alloc_crypto(queue);
800 if (ret)
801 return ret;
802 }
803
804 memset(icresp, 0, sizeof(*icresp));
805 icresp->hdr.type = nvme_tcp_icresp;
806 icresp->hdr.hlen = sizeof(*icresp);
807 icresp->hdr.pdo = 0;
808 icresp->hdr.plen = cpu_to_le32(icresp->hdr.hlen);
809 icresp->pfv = cpu_to_le16(NVME_TCP_PFV_1_0);
810 icresp->maxdata = cpu_to_le32(0x400000); /* 16M arbitrary limit */
811 icresp->cpda = 0;
812 if (queue->hdr_digest)
813 icresp->digest |= NVME_TCP_HDR_DIGEST_ENABLE;
814 if (queue->data_digest)
815 icresp->digest |= NVME_TCP_DATA_DIGEST_ENABLE;
816
817 iov.iov_base = icresp;
818 iov.iov_len = sizeof(*icresp);
819 ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len);
820 if (ret < 0)
821 goto free_crypto;
822
823 queue->state = NVMET_TCP_Q_LIVE;
824 nvmet_prepare_receive_pdu(queue);
825 return 0;
826 free_crypto:
827 if (queue->hdr_digest || queue->data_digest)
828 nvmet_tcp_free_crypto(queue);
829 return ret;
830 }
831
832 static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue,
833 struct nvmet_tcp_cmd *cmd, struct nvmet_req *req)
834 {
835 size_t data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length);
836 int ret;
837
838 if (!nvme_is_write(cmd->req.cmd) ||
839 data_len > cmd->req.port->inline_data_size) {
840 nvmet_prepare_receive_pdu(queue);
841 return;
842 }
843
844 ret = nvmet_tcp_map_data(cmd);
845 if (unlikely(ret)) {
846 pr_err("queue %d: failed to map data\n", queue->idx);
847 nvmet_tcp_fatal_error(queue);
848 return;
849 }
850
851 queue->rcv_state = NVMET_TCP_RECV_DATA;
852 nvmet_tcp_map_pdu_iovec(cmd);
853 cmd->flags |= NVMET_TCP_F_INIT_FAILED;
854 }
855
856 static int nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue *queue)
857 {
858 struct nvme_tcp_data_pdu *data = &queue->pdu.data;
859 struct nvmet_tcp_cmd *cmd;
860
861 cmd = &queue->cmds[data->ttag];
862
863 if (le32_to_cpu(data->data_offset) != cmd->rbytes_done) {
864 pr_err("ttag %u unexpected data offset %u (expected %u)\n",
865 data->ttag, le32_to_cpu(data->data_offset),
866 cmd->rbytes_done);
867 /* FIXME: use path and transport errors */
868 nvmet_req_complete(&cmd->req,
869 NVME_SC_INVALID_FIELD | NVME_SC_DNR);
870 return -EPROTO;
871 }
872
873 cmd->pdu_len = le32_to_cpu(data->data_length);
874 cmd->pdu_recv = 0;
875 nvmet_tcp_map_pdu_iovec(cmd);
876 queue->cmd = cmd;
877 queue->rcv_state = NVMET_TCP_RECV_DATA;
878
879 return 0;
880 }
881
882 static int nvmet_tcp_done_recv_pdu(struct nvmet_tcp_queue *queue)
883 {
884 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
885 struct nvme_command *nvme_cmd = &queue->pdu.cmd.cmd;
886 struct nvmet_req *req;
887 int ret;
888
889 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
890 if (hdr->type != nvme_tcp_icreq) {
891 pr_err("unexpected pdu type (%d) before icreq\n",
892 hdr->type);
893 nvmet_tcp_fatal_error(queue);
894 return -EPROTO;
895 }
896 return nvmet_tcp_handle_icreq(queue);
897 }
898
899 if (hdr->type == nvme_tcp_h2c_data) {
900 ret = nvmet_tcp_handle_h2c_data_pdu(queue);
901 if (unlikely(ret))
902 return ret;
903 return 0;
904 }
905
906 queue->cmd = nvmet_tcp_get_cmd(queue);
907 if (unlikely(!queue->cmd)) {
908 /* This should never happen */
909 pr_err("queue %d: out of commands (%d) send_list_len: %d, opcode: %d",
910 queue->idx, queue->nr_cmds, queue->send_list_len,
911 nvme_cmd->common.opcode);
912 nvmet_tcp_fatal_error(queue);
913 return -ENOMEM;
914 }
915
916 req = &queue->cmd->req;
917 memcpy(req->cmd, nvme_cmd, sizeof(*nvme_cmd));
918
919 if (unlikely(!nvmet_req_init(req, &queue->nvme_cq,
920 &queue->nvme_sq, &nvmet_tcp_ops))) {
921 pr_err("failed cmd %p id %d opcode %d, data_len: %d\n",
922 req->cmd, req->cmd->common.command_id,
923 req->cmd->common.opcode,
924 le32_to_cpu(req->cmd->common.dptr.sgl.length));
925
926 nvmet_tcp_handle_req_failure(queue, queue->cmd, req);
927 return -EAGAIN;
928 }
929
930 ret = nvmet_tcp_map_data(queue->cmd);
931 if (unlikely(ret)) {
932 pr_err("queue %d: failed to map data\n", queue->idx);
933 if (nvmet_tcp_has_inline_data(queue->cmd))
934 nvmet_tcp_fatal_error(queue);
935 else
936 nvmet_req_complete(req, ret);
937 ret = -EAGAIN;
938 goto out;
939 }
940
941 if (nvmet_tcp_need_data_in(queue->cmd)) {
942 if (nvmet_tcp_has_inline_data(queue->cmd)) {
943 queue->rcv_state = NVMET_TCP_RECV_DATA;
944 nvmet_tcp_map_pdu_iovec(queue->cmd);
945 return 0;
946 }
947 /* send back R2T */
948 nvmet_tcp_queue_response(&queue->cmd->req);
949 goto out;
950 }
951
952 queue->cmd->req.execute(&queue->cmd->req);
953 out:
954 nvmet_prepare_receive_pdu(queue);
955 return ret;
956 }
957
958 static const u8 nvme_tcp_pdu_sizes[] = {
959 [nvme_tcp_icreq] = sizeof(struct nvme_tcp_icreq_pdu),
960 [nvme_tcp_cmd] = sizeof(struct nvme_tcp_cmd_pdu),
961 [nvme_tcp_h2c_data] = sizeof(struct nvme_tcp_data_pdu),
962 };
963
964 static inline u8 nvmet_tcp_pdu_size(u8 type)
965 {
966 size_t idx = type;
967
968 return (idx < ARRAY_SIZE(nvme_tcp_pdu_sizes) &&
969 nvme_tcp_pdu_sizes[idx]) ?
970 nvme_tcp_pdu_sizes[idx] : 0;
971 }
972
973 static inline bool nvmet_tcp_pdu_valid(u8 type)
974 {
975 switch (type) {
976 case nvme_tcp_icreq:
977 case nvme_tcp_cmd:
978 case nvme_tcp_h2c_data:
979 /* fallthru */
980 return true;
981 }
982
983 return false;
984 }
985
986 static int nvmet_tcp_try_recv_pdu(struct nvmet_tcp_queue *queue)
987 {
988 struct nvme_tcp_hdr *hdr = &queue->pdu.cmd.hdr;
989 int len;
990 struct kvec iov;
991 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
992
993 recv:
994 iov.iov_base = (void *)&queue->pdu + queue->offset;
995 iov.iov_len = queue->left;
996 len = kernel_recvmsg(queue->sock, &msg, &iov, 1,
997 iov.iov_len, msg.msg_flags);
998 if (unlikely(len < 0))
999 return len;
1000
1001 queue->offset += len;
1002 queue->left -= len;
1003 if (queue->left)
1004 return -EAGAIN;
1005
1006 if (queue->offset == sizeof(struct nvme_tcp_hdr)) {
1007 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1008
1009 if (unlikely(!nvmet_tcp_pdu_valid(hdr->type))) {
1010 pr_err("unexpected pdu type %d\n", hdr->type);
1011 nvmet_tcp_fatal_error(queue);
1012 return -EIO;
1013 }
1014
1015 if (unlikely(hdr->hlen != nvmet_tcp_pdu_size(hdr->type))) {
1016 pr_err("pdu %d bad hlen %d\n", hdr->type, hdr->hlen);
1017 return -EIO;
1018 }
1019
1020 queue->left = hdr->hlen - queue->offset + hdgst;
1021 goto recv;
1022 }
1023
1024 if (queue->hdr_digest &&
1025 nvmet_tcp_verify_hdgst(queue, &queue->pdu, queue->offset)) {
1026 nvmet_tcp_fatal_error(queue); /* fatal */
1027 return -EPROTO;
1028 }
1029
1030 if (queue->data_digest &&
1031 nvmet_tcp_check_ddgst(queue, &queue->pdu)) {
1032 nvmet_tcp_fatal_error(queue); /* fatal */
1033 return -EPROTO;
1034 }
1035
1036 return nvmet_tcp_done_recv_pdu(queue);
1037 }
1038
1039 static void nvmet_tcp_prep_recv_ddgst(struct nvmet_tcp_cmd *cmd)
1040 {
1041 struct nvmet_tcp_queue *queue = cmd->queue;
1042
1043 nvmet_tcp_ddgst(queue->rcv_hash, cmd);
1044 queue->offset = 0;
1045 queue->left = NVME_TCP_DIGEST_LENGTH;
1046 queue->rcv_state = NVMET_TCP_RECV_DDGST;
1047 }
1048
1049 static int nvmet_tcp_try_recv_data(struct nvmet_tcp_queue *queue)
1050 {
1051 struct nvmet_tcp_cmd *cmd = queue->cmd;
1052 int ret;
1053
1054 while (msg_data_left(&cmd->recv_msg)) {
1055 ret = sock_recvmsg(cmd->queue->sock, &cmd->recv_msg,
1056 cmd->recv_msg.msg_flags);
1057 if (ret <= 0)
1058 return ret;
1059
1060 cmd->pdu_recv += ret;
1061 cmd->rbytes_done += ret;
1062 }
1063
1064 nvmet_tcp_unmap_pdu_iovec(cmd);
1065
1066 if (!(cmd->flags & NVMET_TCP_F_INIT_FAILED) &&
1067 cmd->rbytes_done == cmd->req.transfer_len) {
1068 if (queue->data_digest) {
1069 nvmet_tcp_prep_recv_ddgst(cmd);
1070 return 0;
1071 }
1072 cmd->req.execute(&cmd->req);
1073 }
1074
1075 nvmet_prepare_receive_pdu(queue);
1076 return 0;
1077 }
1078
1079 static int nvmet_tcp_try_recv_ddgst(struct nvmet_tcp_queue *queue)
1080 {
1081 struct nvmet_tcp_cmd *cmd = queue->cmd;
1082 int ret;
1083 struct msghdr msg = { .msg_flags = MSG_DONTWAIT };
1084 struct kvec iov = {
1085 .iov_base = (void *)&cmd->recv_ddgst + queue->offset,
1086 .iov_len = queue->left
1087 };
1088
1089 ret = kernel_recvmsg(queue->sock, &msg, &iov, 1,
1090 iov.iov_len, msg.msg_flags);
1091 if (unlikely(ret < 0))
1092 return ret;
1093
1094 queue->offset += ret;
1095 queue->left -= ret;
1096 if (queue->left)
1097 return -EAGAIN;
1098
1099 if (queue->data_digest && cmd->exp_ddgst != cmd->recv_ddgst) {
1100 pr_err("queue %d: cmd %d pdu (%d) data digest error: recv %#x expected %#x\n",
1101 queue->idx, cmd->req.cmd->common.command_id,
1102 queue->pdu.cmd.hdr.type, le32_to_cpu(cmd->recv_ddgst),
1103 le32_to_cpu(cmd->exp_ddgst));
1104 nvmet_tcp_finish_cmd(cmd);
1105 nvmet_tcp_fatal_error(queue);
1106 ret = -EPROTO;
1107 goto out;
1108 }
1109
1110 if (!(cmd->flags & NVMET_TCP_F_INIT_FAILED) &&
1111 cmd->rbytes_done == cmd->req.transfer_len)
1112 cmd->req.execute(&cmd->req);
1113 ret = 0;
1114 out:
1115 nvmet_prepare_receive_pdu(queue);
1116 return ret;
1117 }
1118
1119 static int nvmet_tcp_try_recv_one(struct nvmet_tcp_queue *queue)
1120 {
1121 int result = 0;
1122
1123 if (unlikely(queue->rcv_state == NVMET_TCP_RECV_ERR))
1124 return 0;
1125
1126 if (queue->rcv_state == NVMET_TCP_RECV_PDU) {
1127 result = nvmet_tcp_try_recv_pdu(queue);
1128 if (result != 0)
1129 goto done_recv;
1130 }
1131
1132 if (queue->rcv_state == NVMET_TCP_RECV_DATA) {
1133 result = nvmet_tcp_try_recv_data(queue);
1134 if (result != 0)
1135 goto done_recv;
1136 }
1137
1138 if (queue->rcv_state == NVMET_TCP_RECV_DDGST) {
1139 result = nvmet_tcp_try_recv_ddgst(queue);
1140 if (result != 0)
1141 goto done_recv;
1142 }
1143
1144 done_recv:
1145 if (result < 0) {
1146 if (result == -EAGAIN)
1147 return 0;
1148 return result;
1149 }
1150 return 1;
1151 }
1152
1153 static int nvmet_tcp_try_recv(struct nvmet_tcp_queue *queue,
1154 int budget, int *recvs)
1155 {
1156 int i, ret = 0;
1157
1158 for (i = 0; i < budget; i++) {
1159 ret = nvmet_tcp_try_recv_one(queue);
1160 if (ret <= 0)
1161 break;
1162 (*recvs)++;
1163 }
1164
1165 return ret;
1166 }
1167
1168 static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue)
1169 {
1170 spin_lock(&queue->state_lock);
1171 if (queue->state != NVMET_TCP_Q_DISCONNECTING) {
1172 queue->state = NVMET_TCP_Q_DISCONNECTING;
1173 schedule_work(&queue->release_work);
1174 }
1175 spin_unlock(&queue->state_lock);
1176 }
1177
1178 static void nvmet_tcp_io_work(struct work_struct *w)
1179 {
1180 struct nvmet_tcp_queue *queue =
1181 container_of(w, struct nvmet_tcp_queue, io_work);
1182 bool pending;
1183 int ret, ops = 0;
1184
1185 do {
1186 pending = false;
1187
1188 ret = nvmet_tcp_try_recv(queue, NVMET_TCP_RECV_BUDGET, &ops);
1189 if (ret > 0) {
1190 pending = true;
1191 } else if (ret < 0) {
1192 if (ret == -EPIPE || ret == -ECONNRESET)
1193 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1194 else
1195 nvmet_tcp_fatal_error(queue);
1196 return;
1197 }
1198
1199 ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, &ops);
1200 if (ret > 0) {
1201 /* transmitted message/data */
1202 pending = true;
1203 } else if (ret < 0) {
1204 if (ret == -EPIPE || ret == -ECONNRESET)
1205 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1206 else
1207 nvmet_tcp_fatal_error(queue);
1208 return;
1209 }
1210
1211 } while (pending && ops < NVMET_TCP_IO_WORK_BUDGET);
1212
1213 /*
1214 * We exahusted our budget, requeue our selves
1215 */
1216 if (pending)
1217 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1218 }
1219
1220 static int nvmet_tcp_alloc_cmd(struct nvmet_tcp_queue *queue,
1221 struct nvmet_tcp_cmd *c)
1222 {
1223 u8 hdgst = nvmet_tcp_hdgst_len(queue);
1224
1225 c->queue = queue;
1226 c->req.port = queue->port->nport;
1227
1228 c->cmd_pdu = page_frag_alloc(&queue->pf_cache,
1229 sizeof(*c->cmd_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1230 if (!c->cmd_pdu)
1231 return -ENOMEM;
1232 c->req.cmd = &c->cmd_pdu->cmd;
1233
1234 c->rsp_pdu = page_frag_alloc(&queue->pf_cache,
1235 sizeof(*c->rsp_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1236 if (!c->rsp_pdu)
1237 goto out_free_cmd;
1238 c->req.cqe = &c->rsp_pdu->cqe;
1239
1240 c->data_pdu = page_frag_alloc(&queue->pf_cache,
1241 sizeof(*c->data_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1242 if (!c->data_pdu)
1243 goto out_free_rsp;
1244
1245 c->r2t_pdu = page_frag_alloc(&queue->pf_cache,
1246 sizeof(*c->r2t_pdu) + hdgst, GFP_KERNEL | __GFP_ZERO);
1247 if (!c->r2t_pdu)
1248 goto out_free_data;
1249
1250 c->recv_msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
1251
1252 list_add_tail(&c->entry, &queue->free_list);
1253
1254 return 0;
1255 out_free_data:
1256 page_frag_free(c->data_pdu);
1257 out_free_rsp:
1258 page_frag_free(c->rsp_pdu);
1259 out_free_cmd:
1260 page_frag_free(c->cmd_pdu);
1261 return -ENOMEM;
1262 }
1263
1264 static void nvmet_tcp_free_cmd(struct nvmet_tcp_cmd *c)
1265 {
1266 page_frag_free(c->r2t_pdu);
1267 page_frag_free(c->data_pdu);
1268 page_frag_free(c->rsp_pdu);
1269 page_frag_free(c->cmd_pdu);
1270 }
1271
1272 static int nvmet_tcp_alloc_cmds(struct nvmet_tcp_queue *queue)
1273 {
1274 struct nvmet_tcp_cmd *cmds;
1275 int i, ret = -EINVAL, nr_cmds = queue->nr_cmds;
1276
1277 cmds = kcalloc(nr_cmds, sizeof(struct nvmet_tcp_cmd), GFP_KERNEL);
1278 if (!cmds)
1279 goto out;
1280
1281 for (i = 0; i < nr_cmds; i++) {
1282 ret = nvmet_tcp_alloc_cmd(queue, cmds + i);
1283 if (ret)
1284 goto out_free;
1285 }
1286
1287 queue->cmds = cmds;
1288
1289 return 0;
1290 out_free:
1291 while (--i >= 0)
1292 nvmet_tcp_free_cmd(cmds + i);
1293 kfree(cmds);
1294 out:
1295 return ret;
1296 }
1297
1298 static void nvmet_tcp_free_cmds(struct nvmet_tcp_queue *queue)
1299 {
1300 struct nvmet_tcp_cmd *cmds = queue->cmds;
1301 int i;
1302
1303 for (i = 0; i < queue->nr_cmds; i++)
1304 nvmet_tcp_free_cmd(cmds + i);
1305
1306 nvmet_tcp_free_cmd(&queue->connect);
1307 kfree(cmds);
1308 }
1309
1310 static void nvmet_tcp_restore_socket_callbacks(struct nvmet_tcp_queue *queue)
1311 {
1312 struct socket *sock = queue->sock;
1313
1314 write_lock_bh(&sock->sk->sk_callback_lock);
1315 sock->sk->sk_data_ready = queue->data_ready;
1316 sock->sk->sk_state_change = queue->state_change;
1317 sock->sk->sk_write_space = queue->write_space;
1318 sock->sk->sk_user_data = NULL;
1319 write_unlock_bh(&sock->sk->sk_callback_lock);
1320 }
1321
1322 static void nvmet_tcp_finish_cmd(struct nvmet_tcp_cmd *cmd)
1323 {
1324 nvmet_req_uninit(&cmd->req);
1325 nvmet_tcp_unmap_pdu_iovec(cmd);
1326 kfree(cmd->iov);
1327 sgl_free(cmd->req.sg);
1328 }
1329
1330 static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue)
1331 {
1332 struct nvmet_tcp_cmd *cmd = queue->cmds;
1333 int i;
1334
1335 for (i = 0; i < queue->nr_cmds; i++, cmd++) {
1336 if (nvmet_tcp_need_data_in(cmd))
1337 nvmet_tcp_finish_cmd(cmd);
1338 }
1339
1340 if (!queue->nr_cmds && nvmet_tcp_need_data_in(&queue->connect)) {
1341 /* failed in connect */
1342 nvmet_tcp_finish_cmd(&queue->connect);
1343 }
1344 }
1345
1346 static void nvmet_tcp_release_queue_work(struct work_struct *w)
1347 {
1348 struct nvmet_tcp_queue *queue =
1349 container_of(w, struct nvmet_tcp_queue, release_work);
1350
1351 mutex_lock(&nvmet_tcp_queue_mutex);
1352 list_del_init(&queue->queue_list);
1353 mutex_unlock(&nvmet_tcp_queue_mutex);
1354
1355 nvmet_tcp_restore_socket_callbacks(queue);
1356 flush_work(&queue->io_work);
1357
1358 nvmet_tcp_uninit_data_in_cmds(queue);
1359 nvmet_sq_destroy(&queue->nvme_sq);
1360 cancel_work_sync(&queue->io_work);
1361 sock_release(queue->sock);
1362 nvmet_tcp_free_cmds(queue);
1363 if (queue->hdr_digest || queue->data_digest)
1364 nvmet_tcp_free_crypto(queue);
1365 ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
1366
1367 kfree(queue);
1368 }
1369
1370 static void nvmet_tcp_data_ready(struct sock *sk)
1371 {
1372 struct nvmet_tcp_queue *queue;
1373
1374 read_lock_bh(&sk->sk_callback_lock);
1375 queue = sk->sk_user_data;
1376 if (likely(queue))
1377 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1378 read_unlock_bh(&sk->sk_callback_lock);
1379 }
1380
1381 static void nvmet_tcp_write_space(struct sock *sk)
1382 {
1383 struct nvmet_tcp_queue *queue;
1384
1385 read_lock_bh(&sk->sk_callback_lock);
1386 queue = sk->sk_user_data;
1387 if (unlikely(!queue))
1388 goto out;
1389
1390 if (unlikely(queue->state == NVMET_TCP_Q_CONNECTING)) {
1391 queue->write_space(sk);
1392 goto out;
1393 }
1394
1395 if (sk_stream_is_writeable(sk)) {
1396 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1397 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1398 }
1399 out:
1400 read_unlock_bh(&sk->sk_callback_lock);
1401 }
1402
1403 static void nvmet_tcp_state_change(struct sock *sk)
1404 {
1405 struct nvmet_tcp_queue *queue;
1406
1407 write_lock_bh(&sk->sk_callback_lock);
1408 queue = sk->sk_user_data;
1409 if (!queue)
1410 goto done;
1411
1412 switch (sk->sk_state) {
1413 case TCP_FIN_WAIT1:
1414 case TCP_CLOSE_WAIT:
1415 case TCP_CLOSE:
1416 /* FALLTHRU */
1417 sk->sk_user_data = NULL;
1418 nvmet_tcp_schedule_release_queue(queue);
1419 break;
1420 default:
1421 pr_warn("queue %d unhandled state %d\n",
1422 queue->idx, sk->sk_state);
1423 }
1424 done:
1425 write_unlock_bh(&sk->sk_callback_lock);
1426 }
1427
1428 static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue *queue)
1429 {
1430 struct socket *sock = queue->sock;
1431 struct inet_sock *inet = inet_sk(sock->sk);
1432 struct linger sol = { .l_onoff = 1, .l_linger = 0 };
1433 int ret;
1434
1435 ret = kernel_getsockname(sock,
1436 (struct sockaddr *)&queue->sockaddr);
1437 if (ret < 0)
1438 return ret;
1439
1440 ret = kernel_getpeername(sock,
1441 (struct sockaddr *)&queue->sockaddr_peer);
1442 if (ret < 0)
1443 return ret;
1444
1445 /*
1446 * Cleanup whatever is sitting in the TCP transmit queue on socket
1447 * close. This is done to prevent stale data from being sent should
1448 * the network connection be restored before TCP times out.
1449 */
1450 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
1451 (char *)&sol, sizeof(sol));
1452 if (ret)
1453 return ret;
1454
1455 if (so_priority > 0) {
1456 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_PRIORITY,
1457 (char *)&so_priority, sizeof(so_priority));
1458 if (ret)
1459 return ret;
1460 }
1461
1462 /* Set socket type of service */
1463 if (inet->rcv_tos > 0) {
1464 int tos = inet->rcv_tos;
1465
1466 ret = kernel_setsockopt(sock, SOL_IP, IP_TOS,
1467 (char *)&tos, sizeof(tos));
1468 if (ret)
1469 return ret;
1470 }
1471
1472 write_lock_bh(&sock->sk->sk_callback_lock);
1473 sock->sk->sk_user_data = queue;
1474 queue->data_ready = sock->sk->sk_data_ready;
1475 sock->sk->sk_data_ready = nvmet_tcp_data_ready;
1476 queue->state_change = sock->sk->sk_state_change;
1477 sock->sk->sk_state_change = nvmet_tcp_state_change;
1478 queue->write_space = sock->sk->sk_write_space;
1479 sock->sk->sk_write_space = nvmet_tcp_write_space;
1480 write_unlock_bh(&sock->sk->sk_callback_lock);
1481
1482 return 0;
1483 }
1484
1485 static int nvmet_tcp_alloc_queue(struct nvmet_tcp_port *port,
1486 struct socket *newsock)
1487 {
1488 struct nvmet_tcp_queue *queue;
1489 int ret;
1490
1491 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1492 if (!queue)
1493 return -ENOMEM;
1494
1495 INIT_WORK(&queue->release_work, nvmet_tcp_release_queue_work);
1496 INIT_WORK(&queue->io_work, nvmet_tcp_io_work);
1497 queue->sock = newsock;
1498 queue->port = port;
1499 queue->nr_cmds = 0;
1500 spin_lock_init(&queue->state_lock);
1501 queue->state = NVMET_TCP_Q_CONNECTING;
1502 INIT_LIST_HEAD(&queue->free_list);
1503 init_llist_head(&queue->resp_list);
1504 INIT_LIST_HEAD(&queue->resp_send_list);
1505
1506 queue->idx = ida_simple_get(&nvmet_tcp_queue_ida, 0, 0, GFP_KERNEL);
1507 if (queue->idx < 0) {
1508 ret = queue->idx;
1509 goto out_free_queue;
1510 }
1511
1512 ret = nvmet_tcp_alloc_cmd(queue, &queue->connect);
1513 if (ret)
1514 goto out_ida_remove;
1515
1516 ret = nvmet_sq_init(&queue->nvme_sq);
1517 if (ret)
1518 goto out_free_connect;
1519
1520 port->last_cpu = cpumask_next_wrap(port->last_cpu,
1521 cpu_online_mask, -1, false);
1522 queue->cpu = port->last_cpu;
1523 nvmet_prepare_receive_pdu(queue);
1524
1525 mutex_lock(&nvmet_tcp_queue_mutex);
1526 list_add_tail(&queue->queue_list, &nvmet_tcp_queue_list);
1527 mutex_unlock(&nvmet_tcp_queue_mutex);
1528
1529 ret = nvmet_tcp_set_queue_sock(queue);
1530 if (ret)
1531 goto out_destroy_sq;
1532
1533 queue_work_on(queue->cpu, nvmet_tcp_wq, &queue->io_work);
1534
1535 return 0;
1536 out_destroy_sq:
1537 mutex_lock(&nvmet_tcp_queue_mutex);
1538 list_del_init(&queue->queue_list);
1539 mutex_unlock(&nvmet_tcp_queue_mutex);
1540 nvmet_sq_destroy(&queue->nvme_sq);
1541 out_free_connect:
1542 nvmet_tcp_free_cmd(&queue->connect);
1543 out_ida_remove:
1544 ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
1545 out_free_queue:
1546 kfree(queue);
1547 return ret;
1548 }
1549
1550 static void nvmet_tcp_accept_work(struct work_struct *w)
1551 {
1552 struct nvmet_tcp_port *port =
1553 container_of(w, struct nvmet_tcp_port, accept_work);
1554 struct socket *newsock;
1555 int ret;
1556
1557 while (true) {
1558 ret = kernel_accept(port->sock, &newsock, O_NONBLOCK);
1559 if (ret < 0) {
1560 if (ret != -EAGAIN)
1561 pr_warn("failed to accept err=%d\n", ret);
1562 return;
1563 }
1564 ret = nvmet_tcp_alloc_queue(port, newsock);
1565 if (ret) {
1566 pr_err("failed to allocate queue\n");
1567 sock_release(newsock);
1568 }
1569 }
1570 }
1571
1572 static void nvmet_tcp_listen_data_ready(struct sock *sk)
1573 {
1574 struct nvmet_tcp_port *port;
1575
1576 read_lock_bh(&sk->sk_callback_lock);
1577 port = sk->sk_user_data;
1578 if (!port)
1579 goto out;
1580
1581 if (sk->sk_state == TCP_LISTEN)
1582 schedule_work(&port->accept_work);
1583 out:
1584 read_unlock_bh(&sk->sk_callback_lock);
1585 }
1586
1587 static int nvmet_tcp_add_port(struct nvmet_port *nport)
1588 {
1589 struct nvmet_tcp_port *port;
1590 __kernel_sa_family_t af;
1591 int opt, ret;
1592
1593 port = kzalloc(sizeof(*port), GFP_KERNEL);
1594 if (!port)
1595 return -ENOMEM;
1596
1597 switch (nport->disc_addr.adrfam) {
1598 case NVMF_ADDR_FAMILY_IP4:
1599 af = AF_INET;
1600 break;
1601 case NVMF_ADDR_FAMILY_IP6:
1602 af = AF_INET6;
1603 break;
1604 default:
1605 pr_err("address family %d not supported\n",
1606 nport->disc_addr.adrfam);
1607 ret = -EINVAL;
1608 goto err_port;
1609 }
1610
1611 ret = inet_pton_with_scope(&init_net, af, nport->disc_addr.traddr,
1612 nport->disc_addr.trsvcid, &port->addr);
1613 if (ret) {
1614 pr_err("malformed ip/port passed: %s:%s\n",
1615 nport->disc_addr.traddr, nport->disc_addr.trsvcid);
1616 goto err_port;
1617 }
1618
1619 port->nport = nport;
1620 port->last_cpu = -1;
1621 INIT_WORK(&port->accept_work, nvmet_tcp_accept_work);
1622 if (port->nport->inline_data_size < 0)
1623 port->nport->inline_data_size = NVMET_TCP_DEF_INLINE_DATA_SIZE;
1624
1625 ret = sock_create(port->addr.ss_family, SOCK_STREAM,
1626 IPPROTO_TCP, &port->sock);
1627 if (ret) {
1628 pr_err("failed to create a socket\n");
1629 goto err_port;
1630 }
1631
1632 port->sock->sk->sk_user_data = port;
1633 port->data_ready = port->sock->sk->sk_data_ready;
1634 port->sock->sk->sk_data_ready = nvmet_tcp_listen_data_ready;
1635
1636 opt = 1;
1637 ret = kernel_setsockopt(port->sock, IPPROTO_TCP,
1638 TCP_NODELAY, (char *)&opt, sizeof(opt));
1639 if (ret) {
1640 pr_err("failed to set TCP_NODELAY sock opt %d\n", ret);
1641 goto err_sock;
1642 }
1643
1644 ret = kernel_setsockopt(port->sock, SOL_SOCKET, SO_REUSEADDR,
1645 (char *)&opt, sizeof(opt));
1646 if (ret) {
1647 pr_err("failed to set SO_REUSEADDR sock opt %d\n", ret);
1648 goto err_sock;
1649 }
1650
1651 if (so_priority > 0) {
1652 ret = kernel_setsockopt(port->sock, SOL_SOCKET, SO_PRIORITY,
1653 (char *)&so_priority, sizeof(so_priority));
1654 if (ret) {
1655 pr_err("failed to set SO_PRIORITY sock opt %d\n", ret);
1656 goto err_sock;
1657 }
1658 }
1659
1660 ret = kernel_bind(port->sock, (struct sockaddr *)&port->addr,
1661 sizeof(port->addr));
1662 if (ret) {
1663 pr_err("failed to bind port socket %d\n", ret);
1664 goto err_sock;
1665 }
1666
1667 ret = kernel_listen(port->sock, 128);
1668 if (ret) {
1669 pr_err("failed to listen %d on port sock\n", ret);
1670 goto err_sock;
1671 }
1672
1673 nport->priv = port;
1674 pr_info("enabling port %d (%pISpc)\n",
1675 le16_to_cpu(nport->disc_addr.portid), &port->addr);
1676
1677 return 0;
1678
1679 err_sock:
1680 sock_release(port->sock);
1681 err_port:
1682 kfree(port);
1683 return ret;
1684 }
1685
1686 static void nvmet_tcp_remove_port(struct nvmet_port *nport)
1687 {
1688 struct nvmet_tcp_port *port = nport->priv;
1689
1690 write_lock_bh(&port->sock->sk->sk_callback_lock);
1691 port->sock->sk->sk_data_ready = port->data_ready;
1692 port->sock->sk->sk_user_data = NULL;
1693 write_unlock_bh(&port->sock->sk->sk_callback_lock);
1694 cancel_work_sync(&port->accept_work);
1695
1696 sock_release(port->sock);
1697 kfree(port);
1698 }
1699
1700 static void nvmet_tcp_delete_ctrl(struct nvmet_ctrl *ctrl)
1701 {
1702 struct nvmet_tcp_queue *queue;
1703
1704 mutex_lock(&nvmet_tcp_queue_mutex);
1705 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1706 if (queue->nvme_sq.ctrl == ctrl)
1707 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1708 mutex_unlock(&nvmet_tcp_queue_mutex);
1709 }
1710
1711 static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
1712 {
1713 struct nvmet_tcp_queue *queue =
1714 container_of(sq, struct nvmet_tcp_queue, nvme_sq);
1715
1716 if (sq->qid == 0) {
1717 /* Let inflight controller teardown complete */
1718 flush_scheduled_work();
1719 }
1720
1721 queue->nr_cmds = sq->size * 2;
1722 if (nvmet_tcp_alloc_cmds(queue))
1723 return NVME_SC_INTERNAL;
1724 return 0;
1725 }
1726
1727 static void nvmet_tcp_disc_port_addr(struct nvmet_req *req,
1728 struct nvmet_port *nport, char *traddr)
1729 {
1730 struct nvmet_tcp_port *port = nport->priv;
1731
1732 if (inet_addr_is_any((struct sockaddr *)&port->addr)) {
1733 struct nvmet_tcp_cmd *cmd =
1734 container_of(req, struct nvmet_tcp_cmd, req);
1735 struct nvmet_tcp_queue *queue = cmd->queue;
1736
1737 sprintf(traddr, "%pISc", (struct sockaddr *)&queue->sockaddr);
1738 } else {
1739 memcpy(traddr, nport->disc_addr.traddr, NVMF_TRADDR_SIZE);
1740 }
1741 }
1742
1743 static struct nvmet_fabrics_ops nvmet_tcp_ops = {
1744 .owner = THIS_MODULE,
1745 .type = NVMF_TRTYPE_TCP,
1746 .msdbd = 1,
1747 .has_keyed_sgls = 0,
1748 .add_port = nvmet_tcp_add_port,
1749 .remove_port = nvmet_tcp_remove_port,
1750 .queue_response = nvmet_tcp_queue_response,
1751 .delete_ctrl = nvmet_tcp_delete_ctrl,
1752 .install_queue = nvmet_tcp_install_queue,
1753 .disc_traddr = nvmet_tcp_disc_port_addr,
1754 };
1755
1756 static int __init nvmet_tcp_init(void)
1757 {
1758 int ret;
1759
1760 nvmet_tcp_wq = alloc_workqueue("nvmet_tcp_wq", WQ_HIGHPRI, 0);
1761 if (!nvmet_tcp_wq)
1762 return -ENOMEM;
1763
1764 ret = nvmet_register_transport(&nvmet_tcp_ops);
1765 if (ret)
1766 goto err;
1767
1768 return 0;
1769 err:
1770 destroy_workqueue(nvmet_tcp_wq);
1771 return ret;
1772 }
1773
1774 static void __exit nvmet_tcp_exit(void)
1775 {
1776 struct nvmet_tcp_queue *queue;
1777
1778 nvmet_unregister_transport(&nvmet_tcp_ops);
1779
1780 flush_scheduled_work();
1781 mutex_lock(&nvmet_tcp_queue_mutex);
1782 list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
1783 kernel_sock_shutdown(queue->sock, SHUT_RDWR);
1784 mutex_unlock(&nvmet_tcp_queue_mutex);
1785 flush_scheduled_work();
1786
1787 destroy_workqueue(nvmet_tcp_wq);
1788 }
1789
1790 module_init(nvmet_tcp_init);
1791 module_exit(nvmet_tcp_exit);
1792
1793 MODULE_LICENSE("GPL v2");
1794 MODULE_ALIAS("nvmet-transport-3"); /* 3 == NVMF_TRTYPE_TCP */
Linux with added FPC-III support